131451328121 has 2 divisors, whose sum is σ = 131451328122. Its totient is φ = 131451328120.

The previous prime is 131451328117. The next prime is 131451328157. The reversal of 131451328121 is 121823154131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67178937721 + 64272390400 = 259189^2 + 253520^2 .

It is a cyclic number.

It is not a de Polignac number, because 131451328121 - 2² = 131451328117 is a prime.

It is not a weakly prime, because it can be changed into another prime (131451328111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65725664060 + 65725664061.

It is an arithmetic number, because the mean of its divisors is an integer number (65725664061).

Almost surely, 2^131451328121 is an apocalyptic number.

It is an amenable number.

131451328121 is a deficient number, since it is larger than the sum of its proper divisors (1).

131451328121 is an equidigital number, since it uses as much as digits as its factorization.

131451328121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The spelling of 131451328121 in words is "one hundred thirty-one billion, four hundred fifty-one million, three hundred twenty-eight thousand, one hundred twenty-one".